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Using similarity of triangles, it is found that the true equation is given by:
A) a/b = c/d
Two triangles are similar when they have the same angles. Then, the measures of the sides adjacent to the similar angles are proportional.
In this problem, considering the location of the right angle of the triangle, we have that:
[tex]\frac{a}{c} = \frac{b}{d}[/tex]
[tex]\frac{a}{b} = \frac{c}{d}[/tex]
Hence option A is correct.
More can be learned about similarity of triangles at https://brainly.com/question/11899908